CN105792270A - Discrete event simulation method applied to WiMAX (World Interoperability for MicrowaveAccess) system and platform thereof - Google Patents
Discrete event simulation method applied to WiMAX (World Interoperability for MicrowaveAccess) system and platform thereof Download PDFInfo
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- CN105792270A CN105792270A CN201410816620.2A CN201410816620A CN105792270A CN 105792270 A CN105792270 A CN 105792270A CN 201410816620 A CN201410816620 A CN 201410816620A CN 105792270 A CN105792270 A CN 105792270A
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Abstract
The invention discloses a discrete event simulation method applied to a WiMAX (World Interoperability for MicrowaveAccess) system and a platform thereof. The method comprises the following steps: (1) simulating: while initialization ending condition is false, initializing a system state variable, initializing a clock, scheduling an initialization event or putting the initialization event into an events list; (2) doing loop: setting the clock into the time for occurring a next event, executing the next event, removing the next event from the events list and updating statistical data; and (3) while the set ending condition is true, ending the simulation loop; and meanwhile, generating a statistical report by the system. The platform comprises a physical layer, an MAC layer, a network layer, an application layer and a channel; protocols of the MAC layer and the network layer are directly arranged in a netdevice; and a network layer protocol is loaded on the network layer. According to the method and the platform disclosed by the invention, the simulation content has a high similarity with the practical situation, and the service loading capability of a communication system can be evaluated more truly.
Description
Technical field
The present invention relates to a kind of emulation mode, in particular to a kind of Method of Discrete Event Simulation suitable in WiMAX system and platform thereof.
Background technology
WiMAX full name is WorldInteroperabilityforMicrowaveAccess, i.e. World Interoperability for Microwave Access, WiMax.WiMAX is called IEEE802.16 standard, i.e. broadband wireless access (BroadbandWirelessAccess, BWA) standard.It is an Overview of wireless MAN technologies, is a kind of new air-interface standard proposed for microwave and millimeter wave frequency band.WiMAX has at a distance, high bandwidth transmission feature, and its network performance and the network architecture meet power business characteristic distributions.But, WiMAX China use and popularization faces a frequency application difficult problem.1991, the duplexing frequency of 15 couple of Wireless Management Committee approval 230MHz frequency range and 10 either simplex frequencies were as the special frequency ([(1991) state is without pipe word 5]) of wireless load management system.It is thus desirable to provide a kind of WiMAX system based on 230MHz to need data link layer protocol is made the technical scheme of substantial amounts of improvement, so that the advantage of IEEE802.16 mature protocol should be utilized, adapt to the new feature of 230MHz frequency range again.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes a kind of Method of Discrete Event Simulation suitable in WiMAX system and platform thereof, realize link layer key technology and simulation, the present invention devises the simulation framework of 230MHzWiMAX system, by abstract for system components for networking components such as application, equipment, channel, agreements.The present invention for event, for each event setup time tag, it is achieved network level emulates, obtains 230MHzWiMAX system performance index by emulating by abstract for the behaviors such as system group network, transmission, reception, time scheduling, conflict/keep out of the way.Achieve base station, two kinds of device models of terminal, be respectively adopted different agreements and be operated.Channel model is established based on 230MHz frequency range characteristics of radio channels.The present invention can emulate the function of 230MHzWiMAX system, performance etc., as design and the optimization foundation of data link layer network layer.The present invention gathers stipulations according to power information and establishes application layer transmission pattern, and simulation meets the application layer data of stipulations and sends behavior.Improvement and assessment that pin of the present invention is agreement provide effective means.
It is an object of the invention to adopt following technical proposals to realize:
A kind of Method of Discrete Event Simulation suitable in WiMAX system, it thes improvement is that, described method includes
(1) emulation: initialization termination condition is FALSE, initializes system state variables, initializes clock, dispatches initialization event or primary event is put into list of thing；
(2) circulation: clock setting becomes next event the moment occurs, performs next event, and it is removed from list of thing, update statistical data；
(3) when the termination condition set is as true time, simulation cycles terminates, and simultaneity factor produces statistical report.
Preferably, the time in described discrete events simulation is to jump, and its event is instantaneous generation, the integer representation of one 64 bit of described clock.
Preferably, described list of thing includes the moment with event generation and type describes an event, and event type identification is for the code of simulated events, and event code is all parameterized, also comprises the parameter representing event code in event description.
Preferably, described statistical data is for recording the statistical data of system, in order to represent the statistic of some needs.
Preferably, described termination condition include arriving certain time, after processing n event and when reaching certain value when statistic.
A kind of discrete events simulation platform suitable in WiMAX system that the present invention provides based on another object, it thes improvement is that, described platform includes physical layer, MAC layer, Internet, application layer and channel；
Described physical layer includes base station and terminal two kind equipment model, has been used for agreement installation, channel access, transmission/reception behavior features；
It is arranged in device model between described MAC layer and network layer protocol；Described application layer protocol is carried in Internet.
Preferably, described application layer, with reference to DL/T645 stipulations, the actual frame length of simulation power information acquisition system and transmission frequency, the interbehavior of emulation power information acquisition system, verifies communication carrier ability.
Preferably, described channel adopts 230MHz frequency range, and measured data is imported channel model, rises and includes attenuation characteristic, broadband and narrow-band noise characteristic.
Compared with the prior art, the invention have the benefit that
1, the present invention is a kind of Method of Discrete Event Simulation suitable in WiMAX system, it may be achieved link layer and Internet (optional) key technology and simulation.
2, this emulation takies little computer resource, and the speed of service is fast.The network of 300 node scales, copies and accepts data 1 time, and simulation time is within 2 seconds.
3, import the 230MHz frequency range data through actual measurement, make emulation more authentic and valid.
4, this emulation can export the statistical data wishing to obtain as required neatly, such as the channel access time, and the bit error rate under different channels scene, packet loss, number of retransmissions etc..
5, the present invention gathers stipulations according to power information and establishes application layer transmission pattern, and simulation meets the application layer data of stipulations and sends behavior.Emulation content and practical situation similarity are high, can serious on-the-ground assessment communication system carrying professional ability.
Accompanying drawing explanation
Fig. 1 is a kind of Method of Discrete Event Simulation flow chart suitable in WiMAX system.
Fig. 2 is a kind of discrete events simulation structure chart suitable in WiMAX system provided by the invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The present invention proposes a kind of Method of Discrete Event Simulation suitable in WiMAX system.The specific scheme is that
Utilize OO thought, by base station, terminal is abstract is two kind equipment models (NetDevice), the physical layer information that model realization is basic, and reserved MAC protocol interface and network layer protocol interface, device model can complete the behaviors such as agreement installation, channel access, transmission/reception.
On being arranged in device model between MAC layer and network layer protocol.Application layer protocol (645App) is carried on Internet.Application layer, with reference to DL/T645 stipulations, the actual frame length of simulation power information acquisition system and transmission frequency, can highly emulate the interbehavior of power information acquisition system, verify communication carrier ability.
Channel (230Channel) adopts 230MHz frequency range, and measured data is imported channel model.Including attenuation characteristic, broadband, narrow-band noise characteristic etc..Accompanying drawing 2 is phantom Organization Chart.
As shown in Figure 1, the present invention adopts a kind of Method of Discrete Event Simulation suitable in WiMAX system, and the Method of Discrete Event Simulation key element that the present invention adopts includes: system state variables, system event occurrence logic.The two factor and simulated behavior itself have direct relation.Specific as follows:
1) start: initialization termination condition is FALSE.Initialize system state variables.Initialize clock (Clock).Scheduling (Schedule) initialization event (puts into list of thing by primary event.
2) circulation (" Doloop " or " Whileloop "):
While (termination condition (EndingCondition) is FALSE) thendo:
{
Clock setting become next event the moment occurs.
Perform next event, and it is removed from list of thing (EventsList).
Update statistical data.
}
3) (End) is terminated: when the termination condition set is as true time, simulation cycles terminates, simultaneity factor generation statistical report.
Wherein, other factors involved in the present invention is specific as follows:
(1) clock.Analogue system have to keep the tracking to current simulation time.In the discrete events simulation of the present invention, the time is to jump, and event is instantaneous generation.Along with the progress of emulation, clock transition is to the time started of next event.The internal simulation clock integer representation of one 64 bit of this method.
(2) list of thing.The method devises one simulated events list of maintenance, and moment and the type of an event event generation describe, and event type identification is for the code of simulated events, and event code is all parameterized, also comprises the parameter representing event code in event description.
(3) randomizer.According to system model, analogue system needs to produce various types of stochastic variable.This is produced by one or more pseudorandom number generators.
(4) statistical data
Analogue system would generally record the statistical data of system, in order to represent the statistic of some needs.
(5) termination condition
Event is bootstrapping, and Discrete Event Simulation System can be run down forever in theory.Therefore, the present invention devises three kinds of termination conditions: 1, arrive certain time 2, when processing after n event 3, reaching certain value when statistic.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit; the specific embodiment of the present invention still can be modified or equivalent replacement by those of ordinary skill in the field with reference to above-described embodiment; these are without departing from any amendment of spirit and scope of the invention or equivalent replace, within the claims of the present invention all awaited the reply in application.
Claims (8)
1. the Method of Discrete Event Simulation being applicable to WiMAX system, it is characterised in that described method includes
(1) emulation: initialization termination condition is FALSE, initializes system state variables, initializes clock, dispatches initialization event or primary event is put into list of thing；
(2) circulation: clock setting becomes next event the moment occurs, performs next event, and it is removed from list of thing, update statistical data；
(3) when the termination condition set is as true time, simulation cycles terminates, and simultaneity factor produces statistical report.
2. a kind of Method of Discrete Event Simulation suitable in WiMAX system as claimed in claim 1, it is characterised in that the time in described discrete events simulation is to jump, and its event is instantaneous generation, the integer representation of one 64 bit of described clock.
3. a kind of Method of Discrete Event Simulation suitable in WiMAX system as claimed in claim 1, it is characterized in that, described list of thing includes the moment with event generation and type describes an event, event type identification is for the code of simulated events, event code is all parameterized, also comprises the parameter representing event code in event description.
4. a kind of Method of Discrete Event Simulation suitable in WiMAX system as claimed in claim 1, it is characterised in that described statistical data is for recording the statistical data of system, in order to represent the statistic of some needs.
5. a kind of Method of Discrete Event Simulation suitable in WiMAX system as claimed in claim 1, it is characterised in that described termination condition includes arriving certain time, after processing n event and when reaching certain value when statistic.
6. the discrete events simulation platform being applicable to WiMAX system, it is characterised in that described platform includes physical layer, MAC layer, Internet, application layer and channel；
Described physical layer includes base station and terminal two kind equipment model, has been used for agreement installation, channel access, transmission/reception behavior features；
It is arranged in device model between described MAC layer and network layer protocol；Described application layer protocol is carried in Internet.
7. a kind of discrete events simulation platform suitable in WiMAX system as claimed in claim 6, it is characterized in that, described application layer is with reference to DL/T645 stipulations, the actual frame length of simulation power information acquisition system and transmission frequency, the interbehavior of emulation power information acquisition system, verifies communication carrier ability.
8. a kind of discrete events simulation platform suitable in WiMAX system as claimed in claim 6, it is characterised in that described channel adopts 230MHz frequency range, and measured data is imported channel model, rises and includes attenuation characteristic, broadband and narrow-band noise characteristic.
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